The invention provides an online regulating method for a slipping phenomenon of a five-machine frame cold continuous rolling machine set, and relates to the technical field of cold continuous rollingproduction. The online regulating method comprises the following steps: 1, establishing a strip steel slipping discrimination model based on trace deformation degree; if the monitored real-time advancing slipping value fi of a machine frame meets the model, executing step 2; if the monitored real-time advancing slipping value fi of the machine frame meets the model and the machine frame is in an accelerating process, executing step 3.2; if a slipping phenomenon does not exist, executing step 4; 2, establishing strip steel slipping regulating and controlling means priorities; 3, regulating fromhigh to low according to the priorities; computing slipping discrimination conditions in real time in a regulating process, if the strip steel slips, executing the step 2 and the step 3; if slippingis eliminated, executing the step 4; 4, if the slipping is eliminated, performing speed judgment, if the current rolling speed meets the condition that the slipping is eliminated, ending the regulating process, if the current rolling speed does not meet a speed requirement, entering an accelerating process to execute the step 1. According to the method, the slipping phenomenon is eliminated, and meanwhile, the production speed of the cold continuous rolling machine set is ensured, and the occurrence rate of production accidents is reduced.